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4.2
ADJUSTMENTS AND CONTROLS
4.2.1
LISTENING VOLUME: The volume control knob (Fig. 1, #1) allows
adjustment of the listening volume of audio signal coming through the front-panel
speaker. Turn the volume control clockwise to increase the volume and counter-
clockwise to decrease it. If you are using a headset (the THB-14, sold separately),
the volume control knob also controls the listening volume through the headset.
4.2.2
SPEAKER ON/OFF: If you are using the optional THB-14 headset (part
no. 900298-015), you may want to turn off the front-panel speaker. This is done
with the speaker on/off switch (Fig. 1, #4).
4.2.3
SQUELCH CONTROL: The squelch helps suppress background noises
created by sea creatures, human activity, or other sources (e.g., snapping shrimp,
croakers, motor boats, pool pumps). To activate the squelch circuit, toggle the
squelch switch (Fig. 1, #8) to the on position.
The squelch feature of the SP-100D Surface Buddy Phone
tion to be activated only when voice is transmitted. Its innovative technology is
unlike squelch systems used in the past: Instead of relying simply on signal strength,
it actually distinguishes between noise and voice. The voice recognition capabili-
ties of the SP-100D allow it to activate the panel speaker with even the slightest
voice in the greatest noise, such as that found on an active reef. Therefore, the SP-
100D squelch does not suffer the loss of range encountered with other squelch
systems, especially in high-noise environments.
The SP-100D squelch is fully automatic, so no adjustments are necessary.
4.3
RECEPTION
When the SP-100D's power is activated by connecting the TCA-35 transducer
(Step 2 in Section 4.1), the unit enters the receive mode and listens for incoming
signals. Adjust the listening volume to a comfortable level (Section 4.2.1). If you
want to suppress background noises, turn on the squelch (see Section 4.2.3).
If you would prefer to use a headset, we offer an optional headset with boom
microphone (model THB-14) that connects to the microphone jack on the SP-
100D panel. You have the option of turning off the speaker (Section 4.2.2) while
you use the headset. The volume control knob (Fig. 1, #1) serves to adjust the
headset's listening volume. When connecting the headset, be sure the listening
volume is turned down, because the volume is much louder in the headset than
through the speaker.
4.4
TRANSMISSION
To talk to a diver and/or another surface station, hold the HHM-3 microphone
within 1/4 inch of your lips (or ensure the boom microphone of the THB-14 head-
causes sound recep-
®
8
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